On Thu, May 12, 2016 at 11:58:43AM +0530, Vineet Gupta wrote: > On Thursday 12 May 2016 01:06 AM, Peter Zijlstra wrote: > > On Mon, May 09, 2016 at 10:53:43PM +0530, Vineet Gupta wrote: > > > >> > Right thats what I feared. But hold on, I don't think we need to change the ABI to > >> > achieve what we want. Gosh why did I even take that path. > >> > > >> > Currently the errno switch case in perf_evsel__open_strerror() in doesn't handle > >> > ENOTSUPP. So how about we add that - augmented with the same sample_period !0 > >> > check to barf for lack of sampling support. > >> > > >> > Do you see anything wrong with that ? > > > > Should work I think. > > Tried that and doesn't even compile. Reconfirms what Vince said, ENOTSUPP is not > exposed to userspace (being in include/linux and not include/uapi/linux) Durr, so what does userspace see?
